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comparison test/runtime/CreateMirror/ArraysNewInstanceBug.java @ 24157:f4e6ddeb5b6f jvmci-0.31

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race in field updates when creating ArrayKlasses can lead to crash (JDK-8182397)
author Doug Simon <doug.simon@oracle.com>
date Wed, 19 Jul 2017 19:44:11 +0200
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24156:28d2f9c907b4 24157:f4e6ddeb5b6f
1 /*
2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test ArraysNewInstanceBug
26 * @bug 8182397
27 * @summary race in setting array_klass field for component mirror with mirror update for klass
28 * @run main/othervm -Xcomp ArraysNewInstanceBug
29 */
30
31 // This test crashes in compiled code with race, because the compiler generates code that assumes this ordering.
32 import java.lang.reflect.Array;
33 import java.net.URL;
34 import java.net.URLClassLoader;
35
36 public class ArraysNewInstanceBug implements Runnable {
37 static Class<?>[] classes;
38
39 int start;
40
41 ArraysNewInstanceBug(int start) {
42 this.start = start;
43 }
44
45 String[] result;
46
47 public void run() {
48 result = new String[classes.length];
49 System.err.print('.');
50 for (int i = start; i < classes.length; i++) {
51 result[i] = Array.newInstance(classes[i], 0).getClass().getName();
52 }
53 }
54
55 public static void main(String[] args) throws Throwable {
56 Class<?> c = ArraysNewInstanceBug.class;
57 ClassLoader apploader = c.getClassLoader();
58 for (int iter = 0; iter < 10 ; iter++) { // 10 is enough to get it to crash on my machine.
59 System.err.print('[');
60 classes = new Class<?>[1000];
61 String urlpath = "file://" + System.getProperty("test.classes") + "/";
62 for (int i = 0; i < classes.length; i++) {
63 ClassLoader loader = new URLClassLoader(new URL[] { new URL(urlpath) }, apploader.getParent());
64 classes[i] = loader.loadClass(c.getSimpleName());
65 }
66 System.err.print(']');
67 System.err.print('(');
68 int threadCount = 64;
69 Thread[] threads = new Thread[threadCount];
70 for (int i = 0; i < threads.length; i++) {
71 threads[i] = new Thread(new ArraysNewInstanceBug(i));
72 }
73 for (int i = 0; i < threads.length; i++) {
74 threads[i].start();
75 }
76 for (int i = 0; i < threads.length; i++) {
77 threads[i].join();
78 }
79 System.err.print(')');
80 }
81 }
82 }